"The biggest brand in digital music, announced today that its subscriber base grew by 143,000 in the fourth quarter, raising Napster's subscriber base to a total of over 410,000, including 56,000 university subscribers. This represents a sequential quarterly increase in subscribers of over 53% percent and continues Napster's rapid growth rate of its subscriber base and its pioneering Napster To Go(TM) portable subscription service, the first of its kind in the world. Based on strong subscriber uptake and stronger than anticipated sales of downloads to subscribers, Napster is raising its fourth quarter revenue estimate to between $16.5 and $17.5 million."This is interesting news. And I'm sure many of you out there (like myself) are curious to know the performance of other online music services compared to iTunes, which tends to grab all the headlines. Now...I wonder how MSN is doing?